Without a watermark, (IE knowing for sure if there was more local air traffic vs the previous couple weeks), you can toss your result. Now I’m seeing the 3-5% difference turn into noticeably less - it’s going to be one or the other because 3-5% in this world is nothing - 5% would be 50K positions on a 1M position day and you can get that by parking your car in a different spot (probably not really, but more of less for making the point).
As @Dxista mentioned, maybe drop gain and see if that helps, if not, toss that filter inline and experiment. Higher gain antenna in an otherwise identical setup will more than likely require a gain adjustment to go along with to eliminate overload.
An easy way to understand overload/saturation/interference is to crank your stereo up as high as you can stand it…now try to pick out certain sounds in a clear manner. Now how does it work when you lower the volume? Same deal…
Regarding RF Scan, here are a few how-to’s posted by @abcd567 which should get you sorted on that end: Do I Need A Filter?